xf(x)=x^2-6x+21

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Solution for xf(x)=x^2-6x+21 equation: 


Simplifying
xf(x) = x2 + -6x + 21

Multiply fx * x
fx2 = x2 + -6x + 21

Reorder the terms:
fx2 = 21 + -6x + x2

Solving
fx2 = 21 + -6x + x2

Solving for variable 'f'.

Move all terms containing f to the left, all other terms to the right.

Divide each side by 'x2'.
f = 21x-2 + -6x-1 + 1

Simplifying
f = 21x-2 + -6x-1 + 1

Reorder the terms:
f = 1 + 21x-2 + -6x-1

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